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fan@saikenpumps.com
The Magnetic Drive Stainless Steel Gear Pump consists of a pump, a magnetic actuator and a motor. The key component magnetic actuator consists of an outer magnetic rotor, an inner magnetic rotor and a non-magnetic isolation sleeve. When the motor drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and the non-magnetic material, and drive the inner magnetic rotor connected with the impeller to rotate synchronously to realize the non-contact transmission of the power, and convert the dynamic seal into a static seal. Since the pump shaft and the inner magnetic rotor are pumped. The isolation sleeve is completely enclosed, thus completely solving the problem of "running, rushing, dripping and leaking", eliminating the flammable, explosive and toxic of the refining and chemical industry. Hazardous media leaks through the pump seal. It has effectively guaranteed the physical and mental health and productivity of employees.
First, the structural characteristics:
1, permanent magnet
The permanent magnet made of rare earth permanent magnet material has a wide operating temperature range (-45-400 ° C), high coercive force, good anisotropy in the direction of the magnetic field, and no demagnetization when the same pole phase is close. It is a good source of magnetic field.
2, isolation sleeve
When a metal isolating sleeve is used, the spacer is in a sinusoidal alternating magnetic field, and an eddy current is induced and converted into heat in a section perpendicular to the direction of the magnetic field line. The expression of the eddy current is. Among them Pe- eddy current: K-constant: n - rated speed of the pump: T-magnetic drive torque: pressure in the F-sleeve; D-sleeve inner diameter; resistivity of a material: - tensile strength of the material. When the pump is designed, n and T are given by the working conditions, and the eddy current can only be reduced from F. D. Consider other aspects. Choose high resistivity. The high-strength non-metallic material is used to make the isolation sleeve, which is very effective in reducing the eddy current.
3. Control of cooling lubricant flow rate
When the magnetic stainless steel gear pump is running, the air gap region between the inner magnetic rotor and the spacer sleeve and the friction pair of the sliding bearing are flushed and cooled with a small amount of liquid. The flow rate of the coolant is usually 2% to 3% of the pump design flow rate, and the annulus region between the inner magnetic rotor and the isolation sleeve generates high heat due to the eddy current. When the cooling fluid is not enough or the flushing holes are not smooth. When plugged, it will cause the medium temperature to be higher than the operating temperature of the permanent magnet, causing the inner magnetic rotor to gradually lose its magnetism and invalidate the magnetic actuator. When the medium is water or water-based liquid, the temperature rise in the annulus region can be maintained at 3-5 ° C: when the medium is hydrocarbon or oil, the temperature rise in the annulus region can be maintained at 5-8 ° C.
4, sliding bearing
The magnetic stainless steel gear pump sliding bearing material is impregnated graphite. Filled with polytetrafluoroethylene. Engineering ceramics, etc. Made of engineering ceramics. Since the engineering ceramics are very brittle and the expansion coefficient is small, the bearing clearance must not be too small to avoid the occurrence of a shaft hazard. Since the sliding bearing of the magnetic pump is lubricated by the medium to be conveyed, the bearing should be made of different materials according to different media and working conditions.
5, protection measures
When the driven component of the magnetic actuator is operated under overload or the rotor is stuck, the main body of the magnetic actuator. The driven parts will automatically slip off and protect the pump. At this time, the permanent magnet on the magnetic actuator will generate a vortex loss under the action of the alternating magnetic field of the active rotor. Magnetic loss. Causes the temperature of the permanent magnet to rise. The magnetic actuator slipped out.
Second, the advantages of the magnetic pump:
Magnetic stainless steel gear pumps have the following advantages over centrifugal pumps that use mechanical seals or packing seals.
a. The pump shaft is changed into a closed static seal by the dynamic seal, which completely avoids the leakage of the medium.
b. No need for independent lubrication and cooling water, reducing energy consumption.
c. From the coupling drive to synchronous drag, there is no contact and friction, power consumption is small, high efficiency, and has damping damping effect, which reduces the influence of motor vibration on the pump and the motor when the cavitation vibration occurs. Impact.
d. When overloading, the inner and outer magnetic rotors are relatively slippery off to the motor. The pump has a protective effect.
Third, note:
1. Prevent particles from entering
a. Ferromagnetic impurities are not allowed. The particles enter the magnetic actuator and the bearing friction pair.
b. After conveying the medium which is easy to crystallize or precipitate, it should be flushed in time (after pumping, pump the water into the pump chamber, and discharge it after 1 minute) to ensure the service life of the sliding bearing.
c. When transporting media containing solid particles, it should be filtered at the inlet of the pump flow tube.
2, prevent demagnetization
a, the magnetic moment can not be designed too small.
b. It should be operated under the specified temperature conditions, and the medium temperature is strictly prohibited. A platinum resistance temperature sensor can be installed on the outer surface of the magnetic pump isolation sleeve to detect the temperature rise of the annulus region, so that the alarm or shutdown occurs when the temperature exceeds the limit.
3, prevent dry friction
a, idling is strictly prohibited.
b. The medium is strictly forbidden.
c. In the case that the outlet valve is closed, the continuous running time of the pump must not exceed 2 minutes to prevent the magnetic actuator from overheating and failing.
+8617731766260/18233754501
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